pkg: chrootarchive: chroot_linux: fix docker build
pkg: chrootarchive: chroot_linux: fix docker build

The path we're trying to remove doesn't exist after a successful
chroot+chdir because a / is only appended after pivot_root is
successful and so we can't cleanup anymore with the old path.
Also fix leaking .pivot_root dirs under /var/lib/docker/tmp/docker-builder*
on error.

Fix https://github.com/docker/docker/issues/22587
Introduced by https://github.com/docker/docker/pull/22506

Signed-off-by: Antonio Murdaca <f9809039ea4850e75dcb8d80b778844aa463358f@redhat.com>

TheBigBear/docker,TheBigBear/docker,TheBigBear/docker